主显示布局以及代码：
activity_main.xml：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/btDownload"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="点击下载"
/>
<ProgressBar
android:id="@+id/pbDownload"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="100"
android:progress="2"
style="@android:style/Widget.ProgressBar.Horizontal"
/>
<TextView
android:id="@+id/tvDownload"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0%"/>
</LinearLayout>
java代码：
package com.litsoft.main;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
private ProgressBar pbDownload;
private TextView tvDownload;
private Handler handler;
private final static int START_DOWNING = 0;
private final static int FINISH_DOWNING = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initHandler();
setListener();
}
private void setListener() {
// TODO Auto-generated method stub
findViewById(R.id.btDownload).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
new Thread(){
@Override
public void run() {
// TODO Auto-generated method stub
for (int i=0;i<=100;i++){
SystemClock.sleep(200);
Message message = Message.obtain();
message.what = START_DOWNING;
message.arg1 = i;
pbDownload.setProgress(i);
handler.sendMessage(message);
}
Message message = Message.obtain();
message.what = FINISH_DOWNING;
handler.sendMessage(message);
}
}.start();
}
});
}
private void initView() {
// TODO Auto-generated method stub
pbDownload = (ProgressBar) findViewById(R.id.pbDownload);
tvDownload = (TextView) findViewById(R.id.tvDownload);
}
private void initHandler() {
// TODO Auto-generated method stub
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch (msg.what) {
case START_DOWNING:
tvDownload.setText(msg.arg1+"%");
break;
case FINISH_DOWNING:
Toast.makeText(MainActivity.this, "下载完成",20000).show();
break;
}
}
};
}
}
效果：
